CrOS Alt+Tab UI: no-op when UI is aborted (instead of switching window).

ash/common/wm/window_cycle_controller.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_WM_WINDOW_CYCLE_CONTROLLER_H_
 #define ASH_COMMON_WM_WINDOW_CYCLE_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 27 matching lines @@
   // Cycles between windows in the given |direction|.
   void HandleCycleWindow(Direction direction);
 
   // Returns true if we are in the middle of a window cycling gesture.
   bool IsCycling() const { return window_cycle_list_.get() != NULL; }
 
   // Call to start cycling windows. This funtion adds a pre-target handler to
   // listen to the alt key release.
   void StartCycling();
 
-  // Stops the current window cycle and removes the event filter.
-  void StopCycling();
+  // Both of these functions stop the current window cycle and removes the event
+  // filter. The former indicates success (i.e. the new window should be
+  // activated) and the latter indicates that the interaction was cancelled (and
+  // the originally active window should remain active).
+  void CompleteCycling();
+  void CancelCycling();
 
-  // Returns the WindowCycleList. Really only useful for testing.
+  // Returns the WindowCycleList.
   const WindowCycleList* window_cycle_list() const {
     return window_cycle_list_.get();
   }
 
  private:
   // Cycles to the next or previous window based on |direction|.
   void Step(Direction direction);
 
+  void StopCycling();
+
   std::unique_ptr<WindowCycleList> window_cycle_list_;
 
   // Tracks what Window was active when starting to cycle and used to determine
   // if the active Window changed in when ending cycling.
   WmWindow* active_window_before_window_cycle_ = nullptr;
 
   // Non-null while actively cycling.
   std::unique_ptr<WindowCycleEventFilter> event_filter_;
 
   base::Time cycle_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowCycleController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WINDOW_CYCLE_CONTROLLER_H_